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Policyholder Account Balances - Summary of Policyholder Account Balances by Ranges (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 135,683 $ 136,245    
Variable Annuities        
Policyholder Account Balance [Line Items]        
Policyholder account balances 39,143 40,060 $ 34,370 $ 35,267
Variable Annuities | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,549   1,711  
Variable Annuities | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 4   $ 7  
Variable Annuities | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 0   $ 9  
Variable Annuities | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   9  
Variable Annuities | Up to 1.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 9   10  
Variable Annuities | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 5   3  
Variable Annuities | 1.01% - 2.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4   7  
Variable Annuities | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 451   495  
Variable Annuities | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 451   495  
Variable Annuities | 2.01% - 3.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,088   1,197  
Variable Annuities | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,088   1,197  
Variable Annuities | 3.01% - 4.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 3.01% - 4.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Variable Annuities | 4.01% and above        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.01%   4.01%  
Policyholder account balances $ 5   $ 7  
Variable Annuities | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 5   7  
Variable Annuities | 4.01% and above | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 4.01% and above | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 4.01% and above | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | 4.01% and above | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other        
Policyholder Account Balance [Line Items]        
Policyholder account balances 37,590   32,652  
Variable Annuities | Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Variable Annuities | Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Variable Annuities | Minimum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.01%   1.01%  
Variable Annuities | Minimum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.01%   2.01%  
Variable Annuities | Minimum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.01%   3.01%  
Variable Annuities | Maximum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.00%   2.00%  
Variable Annuities | Maximum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.00%   3.00%  
Variable Annuities | Maximum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.00%   4.00%  
Fixed Annuities        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 28,974 28,728 $ 26,039 25,963
Fixed Annuities | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,526   3,019  
Fixed Annuities | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 997   1,090  
Fixed Annuities | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 508   606  
Fixed Annuities | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 175   392  
Fixed Annuities | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 10,708   $ 8,212  
Fixed Annuities | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 3,528   $ 4,010  
Fixed Annuities | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 136   201  
Fixed Annuities | Up to 1.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 676   855  
Fixed Annuities | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 412   459  
Fixed Annuities | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 120   229  
Fixed Annuities | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,184   2,266  
Fixed Annuities | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 9,017   6,640  
Fixed Annuities | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 171   223  
Fixed Annuities | 1.01% - 2.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 236   202  
Fixed Annuities | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 95   146  
Fixed Annuities | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 53   161  
Fixed Annuities | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 8,462   5,908  
Fixed Annuities | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,421   1,573  
Fixed Annuities | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,271   1,499  
Fixed Annuities | 2.01% - 3.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 85   33  
Fixed Annuities | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1   1  
Fixed Annuities | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2   2  
Fixed Annuities | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 62   38  
Fixed Annuities | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 793   930  
Fixed Annuities | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 793   930  
Fixed Annuities | 3.01% - 4.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 3.01% - 4.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Fixed Annuities | 4.01% and above        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.01%   4.01%  
Policyholder account balances $ 155   $ 166  
Fixed Annuities | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 155   166  
Fixed Annuities | 4.01% and above | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 4.01% and above | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 4.01% and above | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | 4.01% and above | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other        
Policyholder Account Balance [Line Items]        
Policyholder account balances 14,060   12,720  
Fixed Annuities | Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Fixed Annuities | Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Fixed Annuities | Minimum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.01%   1.01%  
Fixed Annuities | Minimum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.01%   2.01%  
Fixed Annuities | Minimum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.01%   3.01%  
Fixed Annuities | Maximum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.00%   2.00%  
Fixed Annuities | Maximum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.00%   3.00%  
Fixed Annuities | Maximum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.00%   4.00%  
UL and Other        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 35,723 35,986 $ 36,220 36,599
UL and Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 24,651   25,782  
UL and Other | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 8   9  
UL and Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 399   384  
UL and Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 32   31  
UL and Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 3,340   $ 3,429  
UL and Other | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 1,256   $ 976  
UL and Other | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 266   261  
UL and Other | Up to 1.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 242   231  
UL and Other | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 32   31  
UL and Other | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 716   453  
UL and Other | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,141   3,517  
UL and Other | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 517   541  
UL and Other | 1.01% - 2.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,624   2,976  
UL and Other | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6,336   6,644  
UL and Other | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6,172   6,483  
UL and Other | 2.01% - 3.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 8   9  
UL and Other | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 156   152  
UL and Other | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 14,295   14,973  
UL and Other | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 14,294   14,972  
UL and Other | 3.01% - 4.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1   1  
UL and Other | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 3.01% - 4.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
UL and Other | 4.01% and above        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.01%   4.01%  
Policyholder account balances $ 3,402   $ 3,525  
UL and Other | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,402   3,525  
UL and Other | 4.01% and above | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 4.01% and above | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 4.01% and above | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | 4.01% and above | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other        
Policyholder Account Balance [Line Items]        
Policyholder account balances 7,293   6,585  
UL and Other | Other | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
UL and Other | Other | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
UL and Other | Minimum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.01%   1.01%  
UL and Other | Minimum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.01%   2.01%  
UL and Other | Minimum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.01%   3.01%  
UL and Other | Maximum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.00%   2.00%  
UL and Other | Maximum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.00%   3.00%  
UL and Other | Maximum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.00%   4.00%  
Retirement Plan Services        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 23,694 $ 23,843 $ 23,479 $ 23,619
Retirement Plan Services | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 8,053   8,550  
Retirement Plan Services | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,205   1,957  
Retirement Plan Services | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,366   2,583  
Retirement Plan Services | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 4,016   3,961  
Retirement Plan Services | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 7,054   $ 6,428  
Retirement Plan Services | Up to 1.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.00%   1.00%  
Policyholder account balances $ 12,304   $ 10,874  
Retirement Plan Services | Up to 1.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 686   573  
Retirement Plan Services | Up to 1.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 681   312  
Retirement Plan Services | Up to 1.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 551   725  
Retirement Plan Services | Up to 1.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,838   3,498  
Retirement Plan Services | Up to 1.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 6,548   5,766  
Retirement Plan Services | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,950   4,433  
Retirement Plan Services | 1.01% - 2.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 533   477  
Retirement Plan Services | 1.01% - 2.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,424   996  
Retirement Plan Services | 1.01% - 2.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,319   1,847  
Retirement Plan Services | 1.01% - 2.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 168   451  
Retirement Plan Services | 1.01% - 2.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 506   662  
Retirement Plan Services | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 2,099   2,289  
Retirement Plan Services | 2.01% - 3.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,582   1,743  
Retirement Plan Services | 2.01% - 3.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 25   542  
Retirement Plan Services | 2.01% - 3.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 489   3  
Retirement Plan Services | 2.01% - 3.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3   1  
Retirement Plan Services | 2.01% - 3.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Retirement Plan Services | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,839   4,319  
Retirement Plan Services | 3.01% - 4.00% | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 3,750   4,193  
Retirement Plan Services | 3.01% - 4.00% | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 75   107  
Retirement Plan Services | 3.01% - 4.00% | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 7   8  
Retirement Plan Services | 3.01% - 4.00% | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 7   11  
Retirement Plan Services | 3.01% - 4.00% | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Retirement Plan Services | 4.01% and above        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.01%   4.01%  
Policyholder account balances $ 1,502   $ 1,564  
Retirement Plan Services | 4.01% and above | At Guaranteed Minimum        
Policyholder Account Balance [Line Items]        
Policyholder account balances 1,502   1,564  
Retirement Plan Services | 4.01% and above | 1-50 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Retirement Plan Services | 4.01% and above | 51-100 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Retirement Plan Services | 4.01% and above | 101-150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances 0   0  
Retirement Plan Services | 4.01% and above | Greater Than 150 Basis Points Above        
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 0   $ 0  
Retirement Plan Services | Minimum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 1.01%   1.01%  
Retirement Plan Services | Minimum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.01%   2.01%  
Retirement Plan Services | Minimum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.01%   3.01%  
Retirement Plan Services | Maximum | 1.01% - 2.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 2.00%   2.00%  
Retirement Plan Services | Maximum | 2.01% - 3.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 3.00%   3.00%  
Retirement Plan Services | Maximum | 3.01% - 4.00%        
Policyholder Account Balance [Line Items]        
Range of guaranteed minimum crediting rate 4.00%   4.00%